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[" 3.If "sin2 theta+sin2 phi=(1)/(2)" an...

[" 3.If "sin2 theta+sin2 phi=(1)/(2)" and "cos2 theta+cos2 phi=(3)/(2)" ,then "cos^(2)(8-6=],[[" (a) "3/8," (b) "5/8," (c) "3/4," (d) "5/4]]

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